JPS6146485A - Rising shock absorbing mechanism in scroll compressor - Google Patents

Abstract

PURPOSE:To absorb shock by transferring to such condition as both scroll chips will rotate while contacting at several points slowly through a damper when the gap between movable and fixed scroll chips is choked. CONSTITUTION:Under the condition where the rotation of movable scroll 8 has increased and the component of centrifugal force produced on the tapered face 18a in the direction of damper 19 exceeds over the energizing pressure of spring 25, an engaging pin 20 is retracted by said component of force. In the retracting process, a sproll 21 will move toward a chamber 22a while feeding oil in damper chamber 22a through small hole 24 to the damper chamber 22b side. When the pin 20 will retract slowly, a gap is produced between scroll chips 7b, 8b of movable scroll 8. Consequently, it can be transferred slowly from 0% rolling operational condition to 100% rolling operation where the scroll chips 7b, 8b will slide at plural points.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a scroll compressor for vehicle air conditioning, and is designed to reduce the impact on the engine and various parts of the compressor when the compressor is started. The present invention relates to a rising shock mitigation mechanism.

Conventional technology Compressors for vehicle air conditioning generally operate by receiving power from the engine, but since the compressor is connected to the engine at a fixed rotation ratio, the compression When the electromagnetic clutch is activated to operate the machine, the refrigerant gas is discharged at the full compression capacity given to the compressor at the same time as the electromagnetic clutch is connected, that is, 100%. Operation status can be obtained. However, achieving 100% operating state at the same time as startup causes overload on various parts of the engine and power transmission mechanism, which not only impairs driving feeling but also causes fluid compression. This may cause problems such as premature wear of the clutch.

Therefore, in a scroll type compressor, a method for alleviating the impact that occurs on the engine and various parts of the compressor when the compressor is started is to prevent the movable scroll piece from sliding against the fixed scroll piece when the compressor is stopped. In other words, a gap is formed between both scroll pieces and no compression space is formed, and the movable scroll pieces are oscillated (revolution) in this state where no compression space is formed.
In other words, at the time of startup, the movable scroll pieces are oscillated with a smaller orbital radius than in normal operating conditions, thereby achieving 0% compression. A method has been proposed in which the device is activated at capacity.

FIG. 8 is a drawing showing its specific structure.

When the balance weight b is mounted on the tip of the main shaft a, a large diameter portion C is provided at the tip of the main shaft a, and a drive pin d is provided protruding from the large diameter portion C from an eccentric position thereof. And then again,
The large diameter portion C is also provided with a concave portion e formed in an arc shape at an eccentric position. On the other hand, an eccentric bush i having a balance weight b has an eccentric hole f corresponding to a burial drive pin d.
However, spring receivers g are provided in correspondence with the recesses e, and the drive pin d is inserted through the eccentric hole f.
By inserting a spring receiver g into one end of the recess e and interposing a spring h between the other end of the recess e and the spring receiver g, the movable scroll piece moves the eccentric bushing i into a fixed scroll piece. The movable scroll piece is provided so as to be biased in the direction of forming a gap between the movable scroll piece and the fixed scroll piece until the rotation of the main shaft a reaches a certain set rotation speed at the time of startup. (Japanese Unexamined Patent Publication No. 58-67903) is provided so that a state of swinging rotation can be obtained without sliding contact, but in the same structure, there is a large diameter part formed at the tip of the main shaft. Since a spring is installed, the installation space for the spring is restricted, and it is difficult to install an appropriate spring. The problem is that when the centrifugal force exceeds the force, the spring is compressed almost instantaneously, making it impossible to obtain an effective impact mitigation effect.

Problems to be Solved by the Invention The present invention attempts to improve the above-mentioned problems by providing a gap between the movable scroll piece and the fixed scroll piece to prevent the oscillating rotation. The change from the state in which the movable scroll piece is in sliding contact with the fixed scroll piece to the state in which it swings and rotates is achieved by vertically moving a member related to the rotation prevention mechanism of the movable scroll via a damper.

The purpose is to enhance the impact mitigation effect by making it possible to do it slowly and with plenty of time.

Means for Solving the Problems The engaging element of the rotation prevention mechanism is formed by engaging the engaging element with a disk hole provided on the back surface of the movable scroll so as to be offset from the center. The movable scroll is arranged to move in the axial direction in response to fluctuations in the orbital radius of the movable scroll, and the movement of the engaging element is adjustable by a damper connected to the engaging element, and the damper is normally The movable scroll is provided so as to be biased in a direction to reduce the revolution radius of the movable scroll via the engagement element and the disk hole by a spring housed in the movable scroll.

EffectThe centrifugal force generated as the movable scroll rotates causes a downward force to act on the anti-rotation mechanism, and when this force closes the gap between the movable scroll piece and the fixed scroll piece. By using a damper, the movable scroll piece and the fixed scroll piece slowly shift to a state in which they come into sliding contact with each other at several locations and rotate while allowing time.

Specific examples of the present invention will be described below.

Embodiment FIGS. 1 to 6 are drawings showing a first embodiment, in which reference numeral 1 indicates a housing that implants the outer shell of the compressor.

The housing 1 is composed of a front housing 2 and a rear housing 3, and the front housing 2 includes a front wall portion 2.
a, and a peripheral wall portion 2b surrounding the outer periphery of the front wall portion 2a, and is formed in a cylindrical shape with a bottom. and rear housing 3
It is also formed into a bottomed cylindrical shape, including a rear wall portion 3a and a peripheral wall portion 3b surrounding the outer peripheral edge of the rear wall portion 3a. That is, the housing 1 is constructed by joining the openings of both housings 2 and 3, which are formed in a cylindrical shape with a bottom, into one body by screwing bolts and nuts (not shown).

The inside of the front housing 2 is fitted with a partition plate 4 located approximately in the middle thereof, and is divided into front and rear parts by this partition 114. That is, a suction chamber 5 is provided on the front wall 2a side, and a compression chamber 6 is provided on the opening side.
is provided. The suction chamber 5 and the compression chamber 6 are provided so as to be able to communicate with each other.

The compression chamber 6 is provided with a fixed scroll 7 and a movable scroll 8, which will be described later.
It is formed by protruding a scroll piece 7b formed in a spiral shape from a toward the front wall portion 2a of the front housing 2.

In the suction chamber 5, a suction port 10 connected to a suction pipe (not shown) is opened in the peripheral wall part 2b, and a bearing part 1 is opened in the front wall part 2a.
1 is provided. A drive shaft 12 is rotatably supported in the bearing portion 11. One end of the drive shaft 12 protruding outside the front housing 2 is connected to an electromagnetic clutch (not shown), while the other end protruding into the front housing 2 is provided with a crankshaft portion 12'. An eccentric bushing 9 is supported on the crankshaft portion 12' so as to be relatively rotatable.
Moreover, they are provided so as to be able to integrally rotate relative to each other around the crankshaft portion 12'. That is, by loosely engaging the connecting pin 9' with the engagement recess 12'' provided at one end of the drive shaft 12, the eccentric bushing 9 is moved in a very small width (1 to 2 mm) around the crankshaft portion 12'. The eccentric bushing 9 and the bearing 17
The above-mentioned movable scroll 8 is pivotally mounted via the shaft.

The movable scroll 8 consists of a base 8a and a scroll piece 8b that protrudes spirally from the base 8a toward the fixed scroll 7, and the scroll piece 8b has a winding direction relative to the scroll piece 7b on the fixed scroll 7 side. It is provided with different

The scroll piece 8a is attached to the base 7a on the fixed scroll 7 side, and the scroll piece 7b is attached to the movable scroll 8.
Each of the scroll pieces 7b and 8b is provided so as to be able to come into sliding contact with the side base 8a, and both scroll pieces 7b and 8b are provided so as to be able to come into sliding contact at a plurality of locations (at least two or more locations) so that a compressed space is formed between them. .

Further, as a rotation prevention mechanism for the movable scroll 8, a plurality of disc hole portions 18.1.8 formed in the shape of shallow holes with a tapered surface 18a on the inner wall portion are provided on the back surface of the base 8a, offset from the center position. Oil dampers 19 and 19 are fixed to the partition plate 4 so as to face the disk holes 18 and 18, and are arranged on the same circumference.
．． Engagement pins 20 and 20, which are engagement elements, are fitted into 19 so as to be movable forward and backward. More specifically, the damper (-) chamber formed in the oil damper 19 is connected to the engagement pin 20 (1).
) The spool 21 connected to the base is divided into a pair of front and rear damper chambers 22a, 22b.The damper chambers 22a and 22b are filled with oil. 24 so that the forces 1 can flow into each other. In addition, a spring 25 is interposed in one of the Dunno chambers 22a,
The engagement pin 20 is normally provided so that its head is biased toward the disc hole 18. The head of the engaging pin 20 is formed into a truncated conical shape with a tapered surface 20a. The par surface 20a is renumbered so that it can come into sliding contact with the minus surface 18a formed in the disc hole 18 through the bias of the spring 25. It is also possible to fill with gas instead of oil. On the other hand, by fitting the base 7a of the fixed scroll 7 into the opening of the front housing 2 as described above, the rear housing 3 side can be filled with gas. A discharge chamber 13 is formed between the base 7a and the rear wall 3a,
In the discharge chamber 13, a discharge port 14 connected to a discharge pipe (not shown) is provided in the peripheral wall portion 3b. Further, a discharge hole 15 is opened in the base plate 7a in correspondence with the central part of the spiral formed by the scroll piece 7b, and a discharge valve 1 is installed in the discharge hole 15.
5' is provided so as to be openable and closable.

Reference numeral 16 indicates a glue retainer for regulating the opening angle of the discharge valve 15'.

In the above embodiment, the disc hole 18 and the engagement pin 2
Although tapered surfaces 18a and 20a are provided on both sides of the engagement pin 20, it is not necessary to provide them on both sides, and it is sufficient to provide them on at least one of the sides. But that's fine.

Next, the operation of the above embodiment will be explained.

FIG. 1 is a diagram showing a state in which the compressor has stopped its operation, and the engaging pin 20 is biased by the spring 25 and its head is deeply engaged with the disc hole 18. . In this way, the engagement pin 20 is connected to the disc hole 18.
Since the head of the movable scroll 8 is in a deeply engaged state, the orbital radius of the
) is the distance between the centers of the eccentric bushing 9 and its drive shaft 12
The length is restricted to 1 square due to the displacement effect with respect to the center, and a gap is created between the scroll pieces 7b and 8b over their entire circumferential surface.

In such a state, by transmitting the driving force of the engine to the drive shaft 12 through the connection operation of an electromagnetic clutch (not shown) provided at one end of the drive shaft 12, the crankshaft portion 12' of the drive shaft 12 is connected. The movable scroll 8 mounted on the shaft rotates (revolutions) while its rotation is restricted.
However, as mentioned above, the orbital radius of the movable scroll 8 is restricted to a length of 11, and there is a gap between the scrolls 7b and 8b over their entire circumferential surface. Therefore, no compression effect can be obtained.

In other words, a state is obtained in which the system starts up with a compressed capacity of 0%.

On the other hand, as the movable scroll 8 oscillates and rotates, centrifugal force is generated in the movable scroll 8, and the rotational speed of the movable scroll 8 increases, and the tapered surface 18a is generated by the centrifugal force. In a state where the component force in the direction of the damper 19 exceeds the biasing pressure of the spring 25, the engagement pin 20 retreats due to the component force, and its head shallowly engages with the disc hole 18. is obtained. Since the head of the engaging pin 20 is shallowly engaged with the disk hole 18 in this way, the orbital radius of the movable scroll 8 is increased to 1□ through the displacement action of the eccentric bushing 9. It becomes the length.

A state in which both the scroll pieces 7b and 8b are in sliding contact at a plurality of locations is obtained.

That is, a compression space is formed between both scroll pieces 7b and 8b, and a state in which refrigerant gas is compressed in the compression space, that is, a normal operating state is obtained, but in the process of retracting the engagement pin 20, , the engagement pin 20 is the damper 1
In the same damper 19, the spool 21 sends the oil in the damper chamber 2a through the small hole 24 to the damper chamber 22b side. regulated by 24. By moving toward the damper chamber 22a in this state, it is possible to obtain the effect of slowly retracting the engagement pin 2o with enough time.

As the engagement pin 2o gradually retreats in this manner, both scroll pieces 7b are attached to the movable scroll 8.
, oscillating rotation with a gap between 8b (0% operation)
Both scroll pieces 7b.

A state in which 8b is in sliding contact at multiple locations and oscillates (
It is possible to obtain an effect of slowly changing to 100% operation with plenty of time, that is, a smooth start-up effect.

Further, when the operation of the scroll compressor is stopped, the centrifugal force acting on the movable scroll 8 disappears.

The engagement pin 20 is released from the centrifugal force that was causing it to retreat against the biasing force of the spring 25. By being released from the centrifugal force in this way, the spool 21 provided in the damper 19 is pushed up by the urging force of the spring 25, and the head of the engagement pin 20 fixed to the spool 21 is pushed up. is the disk hole portion 18 provided in the movable scroll 8 again.
Returns to a state in which it is deeply engaged.

Further, a second embodiment in which the present invention is applied to another anti-rotation mechanism will be described with reference to FIG. 7, only the parts different from the first embodiment. 30, and a tapered hole 31 is bored in the movable plate 30 at a position substantially corresponding to the disk hole portion 18 provided in the movable scroll 8. A ball 32 is swingably inserted into the disc hole 18 and the tapered hole 31, and is held between the bottom surface of the disc hole 18 and the partition plate 4'.

In the second embodiment, FIG. 7 is a drawing showing the state in which the compressor is in operation, and the movable plate 30 fixed to the spool 21 via the iron 21' is rotated by the rotation of the movable scroll 8. Due to the axial component of the accompanying centrifugal force, spring 2
The scroll pieces 7b and 8b are pressed against the partition plate 4' against the urging force 5, and a state (100% operation) of sliding contact is obtained at a plurality of locations on both scroll pieces 7b and 8b. Furthermore, when the compressor stops operating, the centrifugal force generated in the movable scroll 8 disappears, and the spool 21 moves toward the movable scroll 8 by the biasing force of the spring 25, and the balls 32 are moved from the movable scroll 8. 30 in the outer circumferential direction along the tapered surface 31'.

As the ball 32 moves in the outer circumferential direction in this way, a gap is created between both scroll pieces 7b and 8b, and at the time of startup, a gap is created between the scrolls and the operation changes from the state of swinging rotation (0% operation). The scroll pieces 7b and 8b are started, and with enough time due to the action of the damper 19, both scroll pieces 7b and 8b are moved.
is in sliding contact at multiple locations and swings and rotates (100%
operation), and a smooth start-up action can be obtained.

Effects of the Invention The present invention is constructed as described above, and with the construction as described above, the movable scroll is prevented from swinging and rotating with a gap between the movable scroll and the fixed scroll. It is possible to slowly change to a state in which the scroll rotates and oscillates while slidingly contacting the fixed scroll at multiple points, leaving plenty of time, thereby effectively alleviating start-up shock during start-up. I was able to do it. In addition, by starting the movable scroll with a gap between it and the fixed scroll, liquid compression caused by the refrigerant gas remaining in a liquefied state in the compression space during the previous operation can be avoided. We have now been able to effectively eliminate the outbreak.

[Brief explanation of the drawing]

1 to 6 are drawings showing the first embodiment, in which FIG. 1 is a side sectional view showing the entire scroll compressor, and FIG. 2 is a side sectional view of the main parts showing the same operating state. 3 is a sectional view taken along the line A-A, FIG. 4 is a sectional view taken along the line B-Bg, FIG. 5 is a sectional view taken along the line C-C, and FIG. . FIG. 7 is a drawing showing a second embodiment, and is a side sectional view showing the entire scroll type compressor. Moreover, FIG. 8 is an exploded perspective view of the conventional structure. 1 housing, 2 front housing, 2a front wall, 2
b peripheral wall part, 3 rear housing, 3a rear wall part, 3b peripheral wall part, 4 partition panel, 5 suction chamber, 6 compression action chamber, 7 fixed scroll, 78 base, 7b scroll piece, 8 movable scroll, 8a base, 8b scroll piece, 9 eccentric bushing, 9'
connection pin, 10 inlet, 11 bearing, 12 drive shaft, 1
2' crankshaft, 12'' engagement recess, 13 discharge chamber, 14
Discharge port, 15 discharge hole, 15' discharge valve, 16 retainer,
17 bearing, 18 disc hole, 18a tapered surface, 1
9 oil damper, 2o engagement pin, 20a tapered surface,
21 spool, 22a, 22b damper chamber, 24 small hole,
25 springs, 3o movable plate, 31 taper hole, 32 balls. Figure 5

Claims (1)

[Claims] (1) A fixed scroll fixedly disposed within a housing, a main shaft rotatably supported by the housing, and an end of the main shaft mounted so as to be slightly movable relative to the fixed scroll via an eccentric bush. an anti-rotation mechanism formed by a movable scroll that engages in a swinging and rotatable manner, a disc hole provided on the back surface of the movable scroll so as to be offset from the center, and an engagement element that engages with the disc hole. In the scroll compressor, the engaging element is arranged to move in the axial direction in response to fluctuations in the orbital radius of the movable scroll, and the movement of the engaging element is caused by the movement of the engaging element. The movable scroll is adjusted by a damper connected to the damper, and is normally biased by a spring housed in the damper in a direction to reduce the orbital radius of the movable scroll through the engagement element and the disc hole. A rising shock mitigation mechanism in a scroll compressor.